Question

1. Tính a) 5 2/3(hỗn số) - 13/4 ( hỗn số) × 2 2/5 ( hỗn số) b) 2 2/3 ( hỗn số) : ( 5 2/9( hỗn số) -4 1/3 ( hỗn số) Cứu tui 😣😖😰

Answer 1

a)

\(5\dfrac{2}{3}-\dfrac{13}{4}.2\dfrac{2}{5}\)

\(=\dfrac{17}{3}-\dfrac{13}{4}.\dfrac{12}{5}\)

\(=\dfrac{17}{3}-\dfrac{39}{5}\)

\(=\dfrac{85}{15}-\dfrac{117}{15}\)

\(=\dfrac{-32}{15}\)

b)

\(2\dfrac{2}{3}:5\dfrac{2}{9}-4\dfrac{1}{3}\)

\(=\dfrac{8}{3}:\dfrac{47}{9}-\dfrac{13}{3}\)

\(=\dfrac{8}{3}.\dfrac{9}{47}-\dfrac{13}{3}\)

\(=\dfrac{24}{47}-\dfrac{13}{3}\)

\(=\dfrac{72}{141}-\dfrac{611}{141}\)

\(=\dfrac{-539}{141}\)

Answer 2

a: \(=\dfrac{17}{3}-\dfrac{7}{4}\cdot\dfrac{7}{5}=\dfrac{17}{3}-\dfrac{49}{20}=\dfrac{193}{60}\)

b: \(=\dfrac{8}{3}:\dfrac{47}{9}-\dfrac{13}{3}=\dfrac{8}{3}\cdot\dfrac{9}{47}-\dfrac{13}{3}=\dfrac{24}{47}-\dfrac{13}{3}=-\dfrac{539}{141}\)